How to escape curly bracket?

[dakennguyen]

Hi, I want to send a request like this

POST http://localhost:8000/api/v1/messages
Content-Type: application/json

{
    "template": "{{#user~}}I want a response to the following query:{{query}}{{~/user}}"
}

I got this error Environment variable '#user~' was not found. In Insomnia I can put raw string with this

"{% raw %}{{#user~}}I want a response to the following query:{{query}}{{~/user}}{% endraw %}"

How to achieve the same result with rest.nvim?